![Nick Perry A sign warns visitors at 19 Mile Beach along Lake Winnipesaukee, Friday, June 14, 2024, in Tuftonboro N.H., of an algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)](https://mapi.associatedpress.com/v2/items/7f22341430b148cfbd6e25abaa02a56c/preview/preview.jpg?s=680x&wm=false)
A sign warns visitors at 19 Mile Beach along Lake Winnipesaukee, Friday, June 14, 2024, in Tuftonboro N.H., of an algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)
![Nick Perry David Neils, the chief aquatic biologist at the New Hampshire Dept. of Environmental Services, inspects water of Lake Winnipesaukee at 19 Mile Beach, Friday, June 14, 2024, in Tuftonboro N.H., for signs of algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)](https://mapi.associatedpress.com/v2/items/9fdf4d21fbce42f2bab524bc9f0f192b/preview/preview.jpg?s=680x&wm=false)
David Neils, the chief aquatic biologist at the New Hampshire Dept. of Environmental Services, inspects water of Lake Winnipesaukee at 19 Mile Beach, Friday, June 14, 2024, in Tuftonboro N.H., for signs of algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)
![Nick Perry A sign warns visitors at 19 Mile Beach along Lake Winnipesaukee, Friday, June 14, 2024, in Tuftonboro N.H., of an algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)](https://mapi.associatedpress.com/v2/items/b832c4011e764a2cbc9a5384ec808ca1/preview/preview.jpg?s=680x&wm=false)
A sign warns visitors at 19 Mile Beach along Lake Winnipesaukee, Friday, June 14, 2024, in Tuftonboro N.H., of an algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)
![Nick Perry David Neils, the chief aquatic biologist at the New Hampshire Dept. of Environmental Services, inspects water of Lake Winnipesaukee at 19 Mile Beach, Friday, June 14, 2024, in Tuftonboro N.H., for signs of algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)](https://mapi.associatedpress.com/v2/items/05543849eb544bdb9eae60d0ef568e6b/preview/preview.jpg?s=680x&wm=false)
David Neils, the chief aquatic biologist at the New Hampshire Dept. of Environmental Services, inspects water of Lake Winnipesaukee at 19 Mile Beach, Friday, June 14, 2024, in Tuftonboro N.H., for signs of algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)